Safety-barrel for watches.



No. 804,727. PATENTED NOV. 14, 1905. G. F. JOHNSON.

SAFETY BARREL FOR WATCHES.

APPLICATION FILED MAILZS, 1905.

UNITED sTAT s PATENT OFFICE.

GEORGE F. JOHNSON, OF SPRINGFIELD, ILLINOIS, ASSIGNOR TO ILLINOIS WATCHCOMPANY, OF SPRINGFIELD, ILLINOIS, A CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Nov. 14, 1905.

Application filed March 25,1905. Serial No. 252,016.

To aZZ whom, it may concern:

Be it known that I, GEORGE F. JOHNSON, a citizen of the UnitedStates,residing at Springfield, in the county of Sangamon, State ofIllinois, have invented certain new and useful Improvements inSafety-Barrels for l/Vatches, of which the following is a specification,reference being had to the accompanying drawlngs.

My invention relates to safety-barrels for watches; and its object is toconstruct a main wheel and spring-barrel of new and improved structurein which a simple and elficient means is provided for combining thespringbarrel, the main-wheel arbor, the ratchetwheel, and theirsettings. The parts are also so combined that in case the spring breaksthe sudden release of the spring will not put a strain upon the works,but will be thrown 01f through the rotation of the ratchet-wheel.

To these ends my invention consists in the combination of the partshereinafter described.

In the drawings, Figure 1 is a section through the ratchet-wheel portionof the movement plate, spring barrel, and main wheel. Fig. 2 is ahorizontal section on the line 2 2 of Fig. 1. Fig. 3 is a horizontalsection on the line 3 3 of Fig. 1.

Referring to the drawings, t indicates a ratchet-wheel which is providedwith a suitable hub 5, preferably formed integral therewith, as is bestshown in Fig. 1, and which is journaled in a suitable circular openingin a back movementsplate 6, which is recessed, as is shown in Fig. 1, inthe usual manner for the reception of the ratchet-wheel 4L.

7 indicates a spring-barrel which is of the usual form of a short hollowcylinder and which is provided on its upper surface with a circular boss8, which fits within a suitable wheel 4 and is held in place by theheads of the screws 9.

11 indicates a jewel which is secured in place by the jewel-setting 10.As is clearly shown in Fig. 1, the hub 5 and the springbarrel 7 areprovided with a suitable opening through which a spring-arbor,hereinafter described, passes.

12 indicates the main wheel, which is of the shape of a short hollowcylinder, within the top portion of which the lower edge of thespring-barrel 7 enters.

13 indicates the spring-arbor which is secured in the main wheel 12 andprojects upward therefrom, being held in position so that the two willrotate together bya squared portion 14. (See Fig. 3.)

15 indicates a hub which is screwed upon the spring-arbor 13 within thespring-barrel 7 and main wheel 12. The mainspring of the watch is in theusual manner secured at one end upon the hub 15 and at the other end tothe inner surface of the barrel 7. The spring-arbor 13 is provided atits lower end with a pivot 16, adapted to be journaled in any suitablebearing in the watch (not shown) and in the usual manner, and at itsupper end with a pivot 17, which is journaled in the jewel l1.

When the watch is wound,the ratchet-wheel l is rotated, turning in theback movementplate 6 and carrying with it the spring-barrel 7, windingthe spring. \Vhen the winding is completed, the ratchet-wheel being heldfrom rotation in the opposite direction from that in which it was wound,the uncoiling of the spring will of course rotate the springarbor andwith it the main wheel.

In case the mainspring should break it will be seen that theconstruction is such that the releasing of the strain upon the springwill cause the spring-barrel 7 to rotate in the direction in which itwas wound, thus permitting the ratchet-wheel to move and preventing asudden throwing of the strain upon the more delicate parts of the watch.

IVhat I claim as new, and desire to secure by Letters Patent, is

As an improvement in safety-barrels for Watches, the combination with amovementand removably secured to said ratchet-wheel, plate, aratchet-Wheel having an integral hub a main Wheel, and a spring-arborsecured at [O journaled in said movement-plate and proone end of saidmain Wheel and journaled at vicled With a concentric recess upon itsunder the other end, substantially as described.

5 side, and a jewel concentrically mounted in GEORGE F. JOHNSON.

said ratchet-Wheel, of a, spring-barrel pro- Vitnesses:

Vided with a boss on its upper surface adapted GEORGE A. BATES,

to enter the recess in the bottom of said hub AMY SPURWAY.

